Bump external/Catch2 from `9c541ca` to `766541d` (#2926)

Bumps [external/Catch2](https://github.com/catchorg/Catch2) from `9c541ca` to `766541d`.
- [Release notes](https://github.com/catchorg/Catch2/releases)
- [Commits](9c541ca72e...766541d12d)

---
updated-dependencies:
- dependency-name: external/Catch2
  dependency-type: direct:production
...

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external/Catch2

@@ -1 +1 @@
-Subproject commit 9c541ca72e7857dec71d8a41b97e42c2f1c92602
+Subproject commit 766541d12d64845f5232a1ce4e34a85e83506b09